Enter your Age, Gender, Height, Weight, Serum Creatinine, and Cystatin C levels into the Filtration Rate Calculator to get your eGFR, CKD Stage, Kidney Function status, and — for fluid removal calculations — your UFR Safety Status to flag whether your ultrafiltration rate is safe.
Primary Result
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CKD Stage
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Kidney Function
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UFR Safety Status
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A normal GFR is 90 mL/min/1.73m² or higher. GFR values between 60-89 may be normal for some people, especially older adults. Values below 60 for three months or more indicate chronic kidney disease.
Stage 1 (GFR ≥90): Normal or high with kidney damage. Stage 2 (GFR 60-89): Mild decrease with kidney damage. Stage 3 (GFR 30-59): Moderate decrease. Stage 4 (GFR 15-29): Severe decrease. Stage 5 (GFR <15): Kidney failure.
UFR measures how quickly fluid is removed during dialysis, expressed as mL/kg/hour. A safe UFR is generally less than 10-13 mL/kg/hour to reduce cardiovascular stress and improve treatment tolerance.
The CKD-EPI equation is currently the most accurate method for estimating GFR in adults. The 2021 race-free version eliminates racial bias while maintaining clinical accuracy for kidney function assessment.
Cystatin C provides a more accurate GFR estimate when creatinine may be unreliable, such as in patients with unusual muscle mass, vegetarian diets, or when more precision is needed for clinical decisions.
Yes, certain medications can increase serum creatinine without affecting actual kidney function, including ACE inhibitors, ARBs, and some antibiotics. Always consult your healthcare provider about medication effects.
Safe UFR depends on treatment time, patient size, cardiovascular health, and fluid distribution. Longer treatment times and good heart function allow for higher safe removal rates.
Monitoring frequency depends on CKD stage and risk factors. Generally, stages 1-2 require annual monitoring, stage 3 every 6-12 months, and stages 4-5 every 3-6 months or more frequently.